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Yu-Chu Chang, Chou-Tou Shii, and Mei-Chu Chung

the genus Lycoris ( Kurita, 1988 ; Kurita and Hsu, 1996 ). The interspecific hybrids can be propagated asexually through bulblets, and some of them have become widely dispersed. Several chromosome variations have been found in 38 populations of

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Emma C. Lookabaugh, Brian Whipker, and Barbara B. Shew

increased resistance to pythium root rot. However, poinsettia breeding programs recently have incorporated interspecific hybrids of poinsettia and the uncultivated dogwood poinsettia ( Euphorbia cornastra ) or scarlet plume ( Euphorbia fulgens ) into

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Dominic A. Gillooly and Thomas G. Ranney

. Additional sampling in this location would be warranted. Kron and King (1996) postulated that K. polifolia may be a hybrid between two lineages of Kalmia ancestors, which are no longer extant. It has often been found that interspecific hybrids have a

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Irene E. Palmer, Thomas G. Ranney, Nathan P. Lynch, and Richard E. Bir

of both unreduced and aneuploid gametes. Although successful interspecific hybridization was rare and difficult to achieve, one diploid interspecific hybrid of R. subtomentosa × R. hirta was verified. Additional efforts to produce interspecific

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Muhammet Tonguc* and Phillip D. Griffiths

Powdery mildew is a fungal disease of crucifers, caused by Erysiphe polygoni D.C. and it can be problematic during seed increase in green-houses. Crosses were made between Brassica carinata (Ethiopian mustard) accession (PI 360883) and B. oleracea cultivars `Titleist' and `Cecile' to transfer resistance to powdery mildew to B. oleracea germplasm. It was not possible to obtain interspecific hybrids between Ethiopian mustard and B. oleracea through natural seed set. However, interspecific hybrids and backcross one (BC1) progenies were produced via embryo rescue following sexual crosses. Four interspecific hybrid plants were produced with the aid of embryo rescue from cultured pistils with B. carinata as the maternal parent, and their interspecific origin was confirmed through plant morphology and analysis of RAPD polymorphisms. No interspecific hybrids were obtained when `Titleist' was used as a maternal parent. Interspecific hybrid plants were male sterile and they were used as maternal parents to produce BC1 plants. Twenty one BC1 plants were obtained through natural seed set and embryo rescue, although embryo rescue was not necessary to produce first backcross generation plants. When tested in greenhouse with powdery mildew, all interspecific hybrids and eight of the BC1 plants were resistant to the disease. Crosses are being made to produce BC2 plants with 2n = 18 chromosomes for introgression of the resistance in B. oleracea.

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Rebecca M. Harbut, J. Alan Sullivan, John T.A. Proctor, and Harry J. Swartz

creation of Fragaria species hybrids or synthetic octoploids. Each SO is a complex interspecific hybrid composed of at least two Fragaria species and can be easily crossed with the cultivated strawberry. The yield and vegetative growth of three lower

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Patsy E. Wilson, Douglas D. Archbold, Joseph G. Masabni, and S. Kaan Kurtural

composition with minimal decrease in midwinter primary bud cold hardiness ( O’Daniel et al., 2012 ). However, pruning is a rough regulator of yield and does not adequately control crop level or cropload of interspecific hybrids ( Howell et al., 1987 ; Kaps

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Arancha Arbeloa, Ma Elena Daorden, Elena García, Pilar Andreu, and Juan A. Marín

embryos has been used to overcome early embryo abortion in interspecific hybrids ( Ledbetter et al., 1998 ; Liu et al., 2007 ; Stanys, 1998 ). The success of raising plants from immature or aborted embryos depends on their stage of maturity at culture

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Paolo Sabbatini and G. Stanley Howell

chemistry in ‘Pinot gris’ and ‘Pinot noir’ vines, Benton Harbor, MI. Averaging the data collected for ‘Pinot gris’ and ‘Pinot noir’ and comparing with the average of all the interspecific hybrid cultivars' data [Vignoles (Seyval, Delaware, and Marechal Foch

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Rosanna Freyre and Erin Tripp

season. Our study indicates that production of interspecific hybrids is possible, but only in the R. caroliniensis (maternal) × R. simplex (paternal) direction. These hybrids were very weak and slow-growing and, if formed naturally, may possibly be